Bit punch



My- 13, 1930.l

, l.. c. BAYLES BIVT PUNCH Filed Oct. 14. 192'7l yles I t INVENTOR. lewis CB1? Patented May A13, 1930 UNITED SATES y LEWIS c. BAYLES, oF EASTON,rENNsYLvANIaASsIGNoR To rNGERSoLERAND colit-k PANY, oF JERSEY CITY, 'NEW JERSEY, A coRPoRA'rIoN oFNEw JERSEY f Err PUNcR f applicati@ iedyoctober 14, '1527. ksemi No. 226,135.

This invention relates to punchingdevices, but moreparticularly topunches adapted to reform the'bores of hollow articles, such as drill steels in which the bore frequently becornes partially or atQtimes wholly closed during a prior sharpening operation.

AOne object of the invention is to enable the punch pin to be'readilyA freed'from the article intended to be punched without the aid of specialv appliances for Separating these elements whenever they adhere together, due to the expansive action of the heated article Von the comparatively cool punch pin.

Other objects will bein part obvious and in f part pointed out hereinafter.

In the accompanying drawings illustrating a practical application'of the invention,

Figure l is a longitudinal elevation, partly in Section, of a bit punch'hav'ing the. invention `applied thereto,

Figure 2 is a view similarto Figure 1 V of the front endof the bitpunch showing the anvil-'blockin retracted position and thev punch pin driven into the'working 'implef 251nent,and 5 Y Figure 3 is a lView similar to VligureQ showing the position V ofthe anvil blockfor freeing the punch pin from the workingimplej ment. Y Y

Referring more particularly tothe draw ings, A designates a base of a bit punch'havingholes B for-the reception of vbolts' (not shown) whereby said base may be clamped to a support or machine such 'as a drill sharpener. l f v Thebase A is providedat its rearward'end with a cap C having a bore VD to receive slidably aprojetcion E carried by a back head F. The back head F forms a closure for the rear- 40 ward end of a cylinder G which may be secured to the back headlin any suitablemanner. v

Pressure fluidl for actuatingI the bit punchV may be conveyed from'a'suitable source of supply (not shown) through a' coupling H` connected in this instance .to the back head F and communicating with a throttle valve Je through a passage K in the back head. The J throttle valve J controls the admission of 56 pressure fluid into the distributing element (not'shown) but the position of which is in-V dicated as at Lon the side of the cylinder. Y Y Pressure fluid distributed by the distributing element may pass to the front end of the cylinder through an inlet passage O` and into the rearward end of4 the cylinder' G through an inlet passage P forVv actuating a piston Q, in the cylinder G. c 'i j,

As will be observed, the projection E ofthe back head F is disposedslidably in the cap C. Y Due to this arrangement the 'throttle valve J may beopened by manuallysliding the cyl! inder G rearwardly. l Movement of the cylinderin alf-orwardlydirection is 4eifected byv a spring D seated in the bore D and pressing 65 against the projection E.

The throttle valve J has a stemRwhich ex# tends toaA point near the rearward end 'ofthe bore D vand in its 0pen1positi`on abuts a set' screw S in the rearward end of thercap 0 said set screw being adjustable,'will enableY thej-throttle valve J to lbey so adjustedY as'to open it to the,desireddegree'at'the mostvv suitable point during the rearward movement ofthe cylinder f c Y i `The front end of the cylinderG'in thisl in` stance extends slidably into a guidesleeve'l" seatedon the front end of the base Arand preferably secured thereto f by means of clamping bolts U which engage notches V ini so the side ofthe guide sleeve T'to'fhold the guide sleeve T inoperative position.

Disposed in the front end of thecylinder G is av sleeve W which acts as aguide for an anvilblock X having a vshank Y extendingslidably through the bushing W into the cylinder Gr to receive'the blows of the hammer piston QQ The front end of the anvil block X is in theform of a chuck and accordingly hasa bore Z to receive a punch pin b held in operative position in this instance'by apin v v c which engages a notch Zin the shankv of the punch pino. Theoverhangingor punching portion e ofthe punch pin 'Z5Y is conveniently tapered to enable said punchpin'tobe readily driven into ya drill steel f in order to reopen ythe bore g in said drill steel.

By tapering thefpunch pin?) in the manner illustrated there is less' likelihood ofthedrill steel f adhering to the punch pin dueto the 09 chilling effect of the comparatively cold punch pin onthe heated drill steel /".V 1

In orderto Vlimitv the distance Which the shank Y of the anvil block X may extend into the cylinder G, said anvil block is provided With awcollar avvhich, When the anvil block Xis inlits rear'vvardmostt'linitingaposil if e tion, a'buts the frontend of the cylinder G or, as in the present construction, the front Y the 'necessy'j serves .as .an abutment lfor the` front endfof the cylinder.. At the front e-nd endyof the sleeve mit the formation therein'of' a comparatively long recess 7' of such diameter as to permit Vofttree,endirise movementrof .thecollar It of thefanvil gblock'X. ,"The shoulder j `in the guide sleeve resulting from the .formation of idrection. i

as an abutment for .theeollar fl; to limit .the movement of the anvil blocloXvinra ,for-

The mode gef.,1operationof the device,

briefly ldescribedais as io'llovvs {When'a Worki n ing implement `with abore gg .contracted Itoa v.degree @requiring reforming is` pressed and *the -baklheadrmwillbe `moved rear-v wardly-a"snflicientdistance to unseat the yy throttle v'a-lveJ, With ,the-throttle valve J from the`= passage; K f' through the usual pas-f against 4the:punch ,p-infZn withsulcient force 'te .overcome ,the ,pressures `of the lspning at therearward end of the,back head dll, the

cylinder G, together l Witlrthe anvil A block X invrthe openv pesirtion, pressure fluid Will pass sages provided forlthjisppufrpose to .the distributing element whereby rit `will be fdistributed'to the ends of the cylinder thus causing; the ,hammerfpi-ston 1Q to deliver rap- Y ge,-

idlyfrepeaytcd `:blows against :the shank Y of the `anivil block 1X,. "Fforfthe best operation of the devicatheroperator should maintain l acgsulbstantji ally `uniffonm i pressure 'aga-instithe punch `pinrztlo ho-ld'the anvil bleek X within the range of the blows `orf the Ehammer piston vas Well astchold thecylzinder'andbackfhead inlthelrearwvard extreme position "toassure a rconstant su 'l of ressure Huid tothe n n 'PP y P e l rifgadlysecnred to thebaseiforreceiving 'the front end :of the cylinder, .a stop member 'on cylinder Gn i "'ter `the punch has penetrated the Y steel f to the desired depth, the pr.es,

sure against the fpunch pin may .be released by ithe operator; In the absence offsuch j manual pressure, the ,spring D immediately act ,to 'force the cylinder 'and vback head in ,a forwardly .direction `until the front fendt of ,the Cylinder may -.c.ontact with the shoulder j rand at rth-isjpeintthe throttle nvalve Will be carnied :.ontiofcon-tact fro-mthe set screw S. With `the .cylinder :and back head thus oarried-or-Wardly, ,the lthrottle valve J jwill Ibe closed automatically bythe;`

pressure fluid in the passage K acting theref tafnce. V@Wingate the tendencyefthese elements to ad'hema `to each other, itV i-svfes'sential that the Working implement f be removed from-'the punch pin b in the shortest space f timeand,iof course, with the least possible e''ortlf'jSuch removal of the Working implementf]a @be accomplished-in the i present instance ,by imerely pulling sharply vin an outwardly direction on the Workingira.

plement f.- This yviillxpermituthe anvil block X, f.the punch ipin ,b 'and the Working implement f, te be Hmoved in ,an outwardly direc-- tion nahindered until 'thefeol-lar 71, strikes the Wall la: The distance which the ,anvil b'lock `the. Work-ing limplement .may fthius' be moved :before ,the-collar -L impacts against the Wall vail-l enable these parts -to attain suliieient ,'Inernentum v`to yassure )the invariable removal of the Working implement from the l pnnchebit ,Without .necessitating repeated forward and backward thrusts-Lof the Work-ing iniplernentjte achieve this result. v

"Thejpresent invention has .been` found lto confrpletely'eliminate 'the necessity .of especial appliances ,for prying the VWorking imple nient from the punch pin as is `so frequently necessary similar devices in' which the eguivalntef the recessV y' ,isv only of sucient length to permit-off veryfs-light movement Ioff the cellar-lz. jMoreover, omi-ngi it-o the'fact that the present invention enables the-immediate removal fof the' fwcrkingimplement f inem thepnneh pri-n la af-tler-thepunchingoperation there is little ora-io. opportunity forV the heated Working implement to adhereto the punch pin 6. n

'l claim: 1- j Y w -A'ibit punch comprising fa base, a socketin thev base, a .cylinder fcontainzinga rrefcipnoeable piston :and-having :a (back vhead :adapted to extend slidably into the socket, a guide sleeve moyement'of the cylinder, means for iintnodncing'ra supply ef moti-ve' fluid yinto the cyl- 1 -inder to actuate the piston, said meansbeing' held inoperative in the .forvvardposition of the fey'linder, lan anvil fblock. extending infto the lcylinder to receive the blows of the 'piston, appuneh pin .carried by :the fainvil ibloek for reforming .the bores `rofhol'lovv articles, a collar-on 'the .anvil block toiabnt the front end ef .the cylinder, .and an end rWall -en 'the guide sleeve to aot` as lan abutment Vfor :the "i collar for limiting forward movement of the n anvil block, said anvil block having a con# siderably greater range of travel than the cylinder to permit the striking of the collar against the end Wall with suiicient force to j ar the punch pin free from the article.

In testimony whereof I have signed this specification.

LEWIS C. BAYLES. 

